If you have a smartphone, and according to research by Pew and Nielsen, more than half of us do, you've probably downloaded mobile applications or "apps." The Apple App Store and the Google Play Store now offer more than 700,000 apps each, the Wall Street Journal reports, and this year global revenue from app markets is expected to increase 62 percent to $25 billion.

We found that apps can place people into roughly four broad categories: sports nuts, shopaholics, news junkies and arts mavens. Gaming apps, by the way, are a whole universe of their own, which we will save for another day.

What's interesting is that even though the apps point to distinct "app identities," those identities overlap, with many kinds of people using the same mobile tools.

Wondering what type of app user you might be? Our app identity chart might help you figure it out.